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  3. The beginning of our sleep-shortage crisis can be traced back to the invention of the light bulb(灯泡)a century ago. From some dia

The beginning of our sleep-shortage crisis can be traced back to the invention of the light bulb(灯泡)a century ago. From some dia

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问题     The beginning of our sleep-shortage crisis can be traced back to the invention of the light bulb(灯泡)a century ago. From some diaries and other personal accounts in the 18th and 19th centuries, sleep scientists have come to believe that the average people used to sleep about nine hours and a half each night. " The best sleep habits were once forced on us when we had nothing to do in the evening on the farm and it was dark," says sleep specialist Roffwarg.
    By the 1950s and 1960s, that sleep schedule had been decreased greatly to between seven hours and a half and eight hours. Now social and economic tendencies are cutting even deeper.
    Perhaps the most cruel robber of sleep, researches say, is the complex things of the day. Whenever pressures from work, family, friends and community become greater, many people consider their sleep can be given up for them. Another thief of sleep is shift work, in which people work regularly in the evening, at night or on rotating(轮流) schedules, Researchers say the brain has difficulty varying sleep times, which means that these employees usually suffer a final loss of sleep.
    The availability of round-the-clock entertainment, especially all night television, also strengthens the effect of sleep-shortage. Not long ago most TV stations had to close broadcasting at midnight or 1 a. m. to urge many viewers to retire.
According to the writer, the habits of the people’s sleep in the 18th and 19th centuries are found out______.
选项 A、from some diaries written by sleep scientists
B、from some recordings left by people of that time
C、from the experiments made by sleep scientists
D、from some statements of people interviewed by sleep scientists
答案B
解析 第一段第二句话：从18、19世纪遗留的日记和其他个人纪录发现，研究睡眠的科学家认为一般人当时每天要休息九个半小时。因此可以得出B项是正确答案。
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